diff --git a/app-sample/src/main/java/io/noties/markwon/app/samples/ids.py b/app-sample/src/main/java/io/noties/markwon/app/samples/ids.py
new file mode 100644
index 00000000..c38906f3
--- /dev/null
+++ b/app-sample/src/main/java/io/noties/markwon/app/samples/ids.py
@@ -0,0 +1,47 @@
+# script used to fix generated ids of samples (`DD` was used in pattern
+# instead of `dd`, so day in year instead of day in month)
+
+import os
+import re
+from datetime import datetime
+
+
+def samples(array, directory):
+    for f in os.listdir(directory):
+        name = os.path.join(directory, f)
+        if os.path.isdir(name):
+            samples(array, name)
+        elif name.endswith("java") or name.endswith("kt"):
+            array.append(name)
+
+
+def process(sample):
+    with open(sample, "r+") as f:
+        code = f.read()
+        m = re.search(
+            r"(?:\s\S)*@MarkwonSampleInfo\(\s*id\s*\=\s*?\"(\d+)\"(?:\s\S)*", code)
+        if not m:
+            print(
+                "File {} does not contain `@MarkwonSampleInfo` annotation".format(sample))
+        else:
+            group = m.group(1)
+            # `%j` is day in year modifier
+            # for day in year we take substring starting when month ends (year and month are fixed width)
+            #   and end excluding hour, minute and second (also fixed)
+            day = datetime.strptime("{} {}".format(
+                group[6:-6], group[0:4]), "%j %Y").day
+            id = group[:6] + "{:02d}".format(day) + group[-6:]
+            print("{} `{}` -> `{}`".format(sample, group, id))
+            updated_code = code.replace(group, id, 1)
+
+            # https://stackoverflow.com/a/15976014
+            f.seek(0)
+            f.write(updated_code)
+            f.truncate()
+
+
+if __name__ == '__main__':
+    array = []
+    samples(array, ".")
+    for sample in array:
+        process(sample)